Multiple Choice
Which of the following pairs of symbols represent atoms that are isotopes of each other?
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2. Atoms & Elements
Isotopes
Multiple Choice
Which of the following is the mass number of the isotope zinc-63?
A
33
B
63
C
30
D
94
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Verified step by step guidance1
Understand that the mass number of an isotope is the total number of protons and neutrons in the nucleus of the atom.
Recognize that the isotope notation 'zinc-63' indicates that the mass number is 63.
Recall that the atomic number of zinc (which is the number of protons) is 30, but this is not the mass number.
Identify that the mass number is given directly in the isotope name after the element, so for zinc-63, the mass number is 63.
Therefore, among the options provided, the correct mass number corresponding to zinc-63 is 63.
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